Question 1

Which form of DNA has a left-handed helix and its sugar-phosphate backbone zigzags back and forth?

Accepted Answer

A) A-DNA 
B) B-DNA 
C) Z-DNA 
D) All forms of DNA have this secondary structure. 
A) A-DNA 
B) B-DNA 
C) Z-DNA 
D) All forms of DNA have this secondary structure. C

Question 2

According to Chargaff's rules,if a genome is 30% adenine,then what percentage of the genome should be guanine?

Accepted Answer

A) 30% 
B) 35% 
C) 40% 
D) 20% 
E) 70% 
A) 30% 
B) 35% 
C) 40% 
D) 20% 
E) 70% D

Question 3

If a piece of chromatin contained 200 copies of the histone H4,then how many nucleosomes would be present?

Accepted Answer

A) 100 
B) 200 
C) 400 
D) We cannot say: nucleosome structures are randomly placed throughout chromatin. 
A) 100 
B) 200 
C) 400 
D) We cannot say: nucleosome structures are randomly placed throughout chromatin. A

Question 4

Which is NOT one of the tools that Watson and Crick used to solve the structure of DNA?

Accepted Answer

A) all available data on the chemistry of DNA 
B) model building of possible structures 
C) Rosalind Franklin's X-ray diffraction data of DNA 
D) new and revolutionary experimental data that they collected themselves 
E) all of the above 
A) all available data on the chemistry of DNA 
B) model building of possible structures 
C) Rosalind Franklin's X-ray diffraction data of DNA 
D) new and revolutionary experimental data that they collected themselves 
E) all of the above

Question 5

What would Hershey and Chase have concluded if phage ghosts contained 32P label but were absent from infected E.coli? Furthermore,they found 35S lacking in the ghosts and present in the infected E.coli.

Accepted Answer

A) that protein was the genetic material in phage 
B) that DNA was the genetic material in phage 
C) that somehow the radioactivity prevented DNA from getting into E.coli 
D) that protein and DNA together made up the genetic material 
A) that protein was the genetic material in phage 
B) that DNA was the genetic material in phage 
C) that somehow the radioactivity prevented DNA from getting into E.coli 
D) that protein and DNA together made up the genetic material

Question 6

Before DNA was known to be the genetic material,scientists knew that genetic material must do or be all of the following,EXCEPT that

Accepted Answer

A) genetic material must contain complex coding information. 
B) genetic material must be composed of many different units to account for the variability seen in nature. 
C) genetic material must replicate faithfully. 
D) genetic material must encode the phenotype. 
A) genetic material must contain complex coding information. 
B) genetic material must be composed of many different units to account for the variability seen in nature. 
C) genetic material must replicate faithfully. 
D) genetic material must encode the phenotype.

Question 7

Which is NOT true of most bacterial DNA?

Accepted Answer

A) It is packaged into a confined space using proteins. 
B) It appears as a distinct clump called a nucleoid. 
C) It is linear. 
D) It exists in a series of twisted loops. 
A) It is packaged into a confined space using proteins. 
B) It appears as a distinct clump called a nucleoid. 
C) It is linear. 
D) It exists in a series of twisted loops.

Question 8

Heterochromatin is characterized by all of the following,EXCEPT that it

Accepted Answer

A) is present all over the inactive X chromosomes in mammals. 
B) contains genes that require high levels of transcription. 
C) is present on most of the Y chromosome. 
D) remains highly condensed throughout the cell cycle. 
E) is present at centromeres and telomeres. 
A) is present all over the inactive X chromosomes in mammals. 
B) contains genes that require high levels of transcription. 
C) is present on most of the Y chromosome. 
D) remains highly condensed throughout the cell cycle. 
E) is present at centromeres and telomeres.

Question 9

Which statement is true regarding negative supercoiled DNA?

Accepted Answer

A) That negative supercoiled DNA is underrotated allows for easier strand separation during replication and transcription. 
B) Negative supercoiled DNA is not usually seen in cells. 
C) Negative supercoiled DNA has 10 base pairs per turn of its helix. 
D) Negative supercoiled DNA carries more negative charges than positive supercoiled DNA does. 
E) All of the above statements are true. 
A) That negative supercoiled DNA is underrotated allows for easier strand separation during replication and transcription. 
B) Negative supercoiled DNA is not usually seen in cells. 
C) Negative supercoiled DNA has 10 base pairs per turn of its helix. 
D) Negative supercoiled DNA carries more negative charges than positive supercoiled DNA does. 
E) All of the above statements are true.

Question 10

Which is true of the secondary structure of DNA?

Accepted Answer

A) Nucleotide bases are on the outside of the DNA molecule. 
B) Sugar-phosphate groups are on the inside of the DNA molecule. 
C) Bases on complementary strands are held together by hydrogen bonds. 
D) Cytosine pairs with adenine. 
E) Thymine pairs with guanine. 
A) Nucleotide bases are on the outside of the DNA molecule. 
B) Sugar-phosphate groups are on the inside of the DNA molecule. 
C) Bases on complementary strands are held together by hydrogen bonds. 
D) Cytosine pairs with adenine. 
E) Thymine pairs with guanine.

Question 11

Telomeres _________ the end of chromosomes.

Accepted Answer

A) transcribe 
B) replicate 
C) stabilize 
D) destabilize 
A) transcribe 
B) replicate 
C) stabilize 
D) destabilize

Question 12

The genes for ribosomal RNA and transfer RNA contain which kind of the three major classes of DNA?

Accepted Answer

A) highly repetitive DNA 
B) moderately repetitive DNA 
C) unique-sequence DNA 
D) It varies from gene to gene. 
A) highly repetitive DNA 
B) moderately repetitive DNA 
C) unique-sequence DNA 
D) It varies from gene to gene.

Question 13

What would Avery,Macleod,and McCarty have concluded if their results had been that only RNAse treatment of the heat-killed bacteria prevented transformation of genetic virulence?

Accepted Answer

A) that DNA was the genetic material 
B) that RNA was the genetic material 
C) that protein was the genetic material 
D) that DNAse or protease,but not RNase,stimulates transformation 
A) that DNA was the genetic material 
B) that RNA was the genetic material 
C) that protein was the genetic material 
D) that DNAse or protease,but not RNase,stimulates transformation

Question 14

DNA consists of repeating units of nucleotides.Which is NOT a component of a nucleotide?

Accepted Answer

A) a ribose sugar 
B) purine or pyrimidine nitrogen-containing bases 
C) a deoxyribose sugar 
D) phosphate 
E) DNA contains all of the above. 
A) a ribose sugar 
B) purine or pyrimidine nitrogen-containing bases 
C) a deoxyribose sugar 
D) phosphate 
E) DNA contains all of the above.

Question 15

The packaging of DNA into a confined space is what level of DNA structure?

Accepted Answer

A) primary 
B) secondary 
C) tertiary 
D) quaternary 
A) primary 
B) secondary 
C) tertiary 
D) quaternary

Which form of DNA has a left-handed helix and its sugar-phosphate backbone zigzags back and forth?

According to Chargaff's rules,if a genome is 30% adenine,then what percentage of the genome should be guanine?

If a piece of chromatin contained 200 copies of the histone H4,then how many nucleosomes would be present?

Which is NOT one of the tools that Watson and Crick used to solve the structure of DNA?

What would Hershey and Chase have concluded if phage ghosts contained ³²P label but were absent from infected E.coli? Furthermore,they found ³⁵S lacking in the ghosts and present in the infected E.coli.

Before DNA was known to be the genetic material,scientists knew that genetic material must do or be all of the following,EXCEPT that

Which is NOT true of most bacterial DNA?

Heterochromatin is characterized by all of the following,EXCEPT that it

Which statement is true regarding negative supercoiled DNA?

Which is true of the secondary structure of DNA?

Telomeres _________ the end of chromosomes.

The genes for ribosomal RNA and transfer RNA contain which kind of the three major classes of DNA?

What would Avery,Macleod,and McCarty have concluded if their results had been that only RNAse treatment of the heat-killed bacteria prevented transformation of genetic virulence?

DNA consists of repeating units of nucleotides.Which is NOT a component of a nucleotide?

The packaging of DNA into a confined space is what level of DNA structure?

Introduction to Genetics

Chromosomes and Cellular Reproduction

Basic Principles of Heredity

Extensions and Modifications of Basic Principles

Linkage, Recombination, and Eukaryotic Gene Mapping

Bacterial and Viral Genetic Systems

Chromosome Variation

DNA Replication

From DNA to Proteins: Transcription and Rna Processing

From DNA to Proteins: Translation

Control of Gene Expression

Gene Mutations, Transposable Elements, and Dna Repair

Molecular Genetic Analysis, Biotechnology, and Genomics

Cancer Genetics

Quantitative Genetics

Population and Evolutionary Genetics

Filters

Exam 8: DNA: The Chemical Nature of the Gene

Which form of DNA has a left-handed helix and its sugar-phosphate backbone zigzags back and forth?

According to Chargaff's rules,if a genome is 30% adenine,then what percentage of the genome should be guanine?

If a piece of chromatin contained 200 copies of the histone H4,then how many nucleosomes would be present?

Which is NOT one of the tools that Watson and Crick used to solve the structure of DNA?

What would Hershey and Chase have concluded if phage ghosts contained 32P label but were absent from infected E.coli? Furthermore,they found 35S lacking in the ghosts and present in the infected E.coli.

Before DNA was known to be the genetic material,scientists knew that genetic material must do or be all of the following,EXCEPT that

Which is NOT true of most bacterial DNA?

Heterochromatin is characterized by all of the following,EXCEPT that it

Which statement is true regarding negative supercoiled DNA?

Which is true of the secondary structure of DNA?

Telomeres _________ the end of chromosomes.

The genes for ribosomal RNA and transfer RNA contain which kind of the three major classes of DNA?

What would Avery,Macleod,and McCarty have concluded if their results had been that only RNAse treatment of the heat-killed bacteria prevented transformation of genetic virulence?

DNA consists of repeating units of nucleotides.Which is NOT a component of a nucleotide?

The packaging of DNA into a confined space is what level of DNA structure?

Introduction to Genetics

Chromosomes and Cellular Reproduction

Basic Principles of Heredity

Extensions and Modifications of Basic Principles

Linkage, Recombination, and Eukaryotic Gene Mapping

Bacterial and Viral Genetic Systems

Chromosome Variation

DNA Replication

From DNA to Proteins: Transcription and Rna Processing

From DNA to Proteins: Translation

Control of Gene Expression

Gene Mutations, Transposable Elements, and Dna Repair

Molecular Genetic Analysis, Biotechnology, and Genomics

Cancer Genetics

Quantitative Genetics

Population and Evolutionary Genetics

Filters

What would Hershey and Chase have concluded if phage ghosts contained ³²P label but were absent from infected E.coli? Furthermore,they found ³⁵S lacking in the ghosts and present in the infected E.coli.